A device and method for measuring three-dimensional thermal conductivity of frozen soil

Abstract

The invention discloses a device and a method for measuring a heat conductivity coefficient of frozen earth in a three-dimensional direction. The device consists of a temperature control box, a two-body type soil sample chamber and a pressurizing plate, wherein the pressurizing plate is contacted with a multifunctional material testing machine by virtue of a pressurizing rod; the two-body type soil sample chamber consists of a main chamber and a right-angled sleeve wall; and the right-angled sleeve wall is connected with the main chamber by virtue of a lantern ring and a bolt. The implementation method comprises the following steps: sequentially superposing 1-7# soil samples in the main chamber; respectively arranging sheet heat conductivity coefficient probes on contact surfaces of the soil samples 5#, 7#, 2# and 8#; and finally superposing the soil sample 8#, and sequentially mounting the right-angled sleeve wall, the bolt, the lantern ring and the pressurizing plate. The temperature of the frozen earth and freezing and thawing cycle process are controlled by virtue of the temperature control box, the range of a load stressed by the frozen earth is adjusted by virtue of the multifunctional material testing machine, accurate measurement of the three-dimensional heat conductivity coefficient of the frozen earth is realized under multiple factors and coupling effects thereof, and static earth pressure stressed by the frozen earth in the horizontal direction is further calculated by virtue of the relationship between the heat conductivity coefficient in the vertical loading direction and the load.

Description

technical field [0001] The invention relates to a device and method for measuring the three-dimensional thermal conductivity of frozen soil, especially suitable for the measurement of the three-dimensional thermal conductivity of high-temperature frozen soil and the static earth pressure in frozen soil under the multi-factor coupling conditions of temperature, load and environment (freeze-thaw cycle). . Background technique [0002] The temperature field is the foundation and premise of calculating the deformation and strength of frozen soil foundation. The formation and evolution of the temperature field are closely related to the thermal conductivity of frozen soil. Affected by engineering loads (load properties, load values), action time and environmental changes (temperature changes, freeze-thaw cycles), the microstructure (particles-pores-ice crystals) and ice-water dynamic balance in frozen soil are constantly changing. And directly affect the determination of macros...

AI Technical Summary

Problems solved by technology

Regardless of whether it is unfrozen soil or frozen soil, there are many problems in the direct measurement of static earth pressure, such as deformation control and load measurement, side wall friction and principal stress direction, and the influence of soil sample size on static earth pressure. effective solution

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